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italian bottom bracket install(6 posts)

italian bottom bracket installhfc
Jun 5, 2003 5:00 PM
I've put a new 70 mm ultegra bb on my colnago and it keeps coming loose. I tried using teflon tape and it came loose again. I'm trying to do this w/o a torque wrench, so do the recommended specifications mean "really crank that mother down tight" ? Any other ideas (besides loctite) for solving this problem? Thanks again everyone.
Use the torque wrence and see what happens!nmthe bull
Jun 5, 2003 5:30 PM
You gotta use a torque wrench.......davet
Jun 5, 2003 6:25 PM
.....if you don't, you are inviting problems. A good torque wrench from Sears is about 25 bucks and will allow you to correctly torque your crankset and chainring bolts too. You have a nice bike, don't cheap out.
You gotta use a torque wrench......NOT....eddie m
Jun 6, 2003 3:49 AM
That's a common problem with Italian BBs. You need to put the right side in really tight. Use the longest wrench you can find, at least 18", and use blue loctite instead of Teflon tape. I use blue loctite on almost everything on the bike. Nothing backs out, and nothing seizes when I want to remove it.
not a common problem....C-40
Jun 6, 2003 4:44 AM
The problem is not using a torque wrench. I've been using Italian BBs for the last eight years and never had a problem. With a 1/2" drive torque wrench which has a handle that's over a foot long, you have to give it a pretty good pull to get the required 35 ft. lbs.

The idea that left hand threads will keep the right hand BB cup tight is baloney. Left hand threads will only keep the cup from unscrewing AFTER it has become loose. Coming loose is the first place is due to a lack of torque or an improperly faced BB shell. At the minimum, all of the paint should be carefully scraped from the face of the BB shell. I use a razor-sharp utility knife or single edge razor blade and scrape from the outside toward the center to be sure that I don't chip the paint. If that doesn't do it, take it to a shop, if you can find one that has a real mechanic, and have the BB faced. I've never had to face any of my frames.
learn from my mistaketerry b
Jun 6, 2003 5:40 AM
as the others have said - get a torque wrench.

I didn't, and my drive side left the BB shell 15 miles from home. That resulted in - hand tighten, ride one mile, hand tighten, ride one mile, repeat 15 times. That and the nice groove it wore on the inside edge of the left side crank and the BB cup with no splines left to assist in removal.

Not pretty - go to Sears, but a torque wrench and live happily ever after.